package com.nowcoder.community.controller;

import com.nowcoder.community.service.AlphaService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;

//@Controller
@RequestMapping("/alpha")
public class AlphaContraller {

    @Autowired
    private AlphaService alphaService;

    @RequestMapping("/hello")
    @ResponseBody
    public String sayHello(){
        return "Hello Spring Boot.";
    }

    @RequestMapping("/data")
    @ResponseBody
    public String getData(){
        return alphaService.find();
    }

    @RequestMapping("/http")
    public void http(HttpServletRequest request, HttpServletResponse response) {
        // 获取请求数据
        System.out.println(request.getMethod());
        System.out.println(request.getServletPath());
        Enumeration<String> enumeration = request.getHeaderNames();
        while (enumeration.hasMoreElements()){
            String name = enumeration.nextElement();
            String value = request.getHeader(name);
            System.out.println(name + ":" + value);
        }

        System.out.println(request.getParameter("code"));

        //返回响应数据
        response.setContentType("text/html;charset=utf-8");
        try (PrintWriter writer = response.getWriter()){
            writer.write("<h1>牛客网<h1>");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // GET请求
    // 分页显示学生信息，当前第几页，每页显示多少信息
    // /students?current=1&limit=20
    @RequestMapping(value = "/students", method = RequestMethod.GET)
    @ResponseBody
    public String getStudents(
            @RequestParam(name = "current", required = false, defaultValue = "1") int current,
            @RequestParam(name = "limit", required = false, defaultValue = "20") int limit){
        System.out.println(current);
        System.out.println(limit);
        return "some students";
    }

    @RequestMapping(path = "/students/{id}", method = RequestMethod.GET)
    @ResponseBody
    public String getStudent(@PathVariable("id") int id){
        System.out.println(id);
        return "a student";
    }

    //POST请求
    @RequestMapping(path = "/student", method = RequestMethod.POST)
    @ResponseBody
    public String saveStudent(String name, int age){
        System.out.println(name);
        System.out.println(age);
        return "success";
    }

    //响应HTML数据
    @RequestMapping(path = "/teacher", method = RequestMethod.GET)
    public ModelAndView getTeacher(){
        ModelAndView mav = new ModelAndView();
        mav.addObject("name","张三");
        mav.addObject("age",32);
        mav.setViewName("/demo/view");
        return mav;
    }

    @RequestMapping(path = "/school", method = RequestMethod.GET)
    public String getSchool(Model model){
        model.addAttribute("name","华中科技大学");
        model.addAttribute("age",70);
        return "/demo/view";
    }

    // 响应JSON数据(异步请求)
    // Java对象返回给浏览器 -> JSON字符串 -> JS解析对象
    @RequestMapping(path = "/emp",method = RequestMethod.GET)
    @ResponseBody
    public Map<String, Object> getEmp(){
        Map<String, Object> emp = new HashMap<>();
        emp.put("name","张三");
        emp.put("age",22);
        emp.put("salary",8000.0);
        return emp;
    }

    @RequestMapping(path = "/emps",method = RequestMethod.GET)
    @ResponseBody
    public List<Map<String, Object>> getEmps(){
        List<Map<String,Object>> list = new ArrayList<>();

        Map<String, Object> emp = new HashMap<>();
        emp.put("name","张三");
        emp.put("age",22);
        emp.put("salary",8000.0);
        list.add(emp);

        emp = new HashMap<>();
        emp.put("name","李四");
        emp.put("age",33);
        emp.put("salary",9000.0);
        list.add(emp);

        emp = new HashMap<>();
        emp.put("name","王五");
        emp.put("age",18);
        emp.put("salary",3000.0);
        list.add(emp);

        return list;
    }
}
